<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>blur</title>
    <script src = 'jquery-1.12.4.min.js'></script>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .bord{
            border: 1px dashed #ee2602;
            width: 90%;
            margin: 20px auto;
        }
        .title{
            font-size: 20px;
            font-weight: bold;
            margin: 20px;
        }
        .introduce{
            font-size: 16px;
            margin: 0 0 20px 50px;
        }
        .red{
            color: red;
        }
    </style>
    <script>
        jQuery(function ($) {
            $("input").blur( function () { alert("失去焦点"); } );
        });
    </script>
</head>
<body>
<div class="bord">
    <div class="title">blur</div>
    <div class="introduce">当元素失去焦点时触发 blur 事件。</div>
</div>
<div class="bord">
    <div class="title">演示效果</div>
    <div class="introduce">
        <input>失去焦点触发blur事件</input>
    </div>

</div>
<div class="bord">
    <div class="title">代码</div>
    <div class="introduce">
        <pre>
&lt;script&gt;
    jQuery(function ($) {
            $("input").<a class="red">blur</a> ( function () {
            alert("失去焦点");
            } );
        });
&lt;/script&gt;
            <br/>
&lt;div class="introduce"&gt;
        &lt;input&gt;失去焦点触发blur事件&lt;/input&gt;
&lt;/div&gt;
        </pre>
    </div>
</div>
</body>
</html>